Mélange de clones en taillis à courtes rotations de peuplier : influence sur la productivité et l'homogénéité des produits récoltés

2001 ◽  
Vol 31 (7) ◽  
pp. 1116-1126 ◽  
Author(s):  
Alain Berthelot
Keyword(s):  
Hybrid Poplar ◽  
Social Position ◽  
The Other ◽  
Short Rotation Coppice ◽  
Diameter Distribution ◽  
Total Biomass ◽  
Biomass Distribution ◽  
Short Rotation ◽  
Other Hand ◽  
Mean Diameter

Two stands of short-rotation coppice of hybrid poplar were studied from age 3 to harvest (age 7 or 9). The performance of three clones planted at a density of 3000 stems/ha either in mixed- or mono-clonal stands was determined in each stand. Mean diameter and total biomass were not significantly different among the treatments (mixed- or mono-clonal stands). On the other hand, in mixed-clonal plots, biomass distribution was not equally distributed among clones. Diameter distribution was bimodal (two clones) or even trimodal (three clones). At one site (Tourtenay), mortality due to competition affected mostly the suppressed clone ('Boelare'). Mortality is significantly higher for this clone at age 7. With such closed spacings, competition occurs soon and social position is rapidly irreversible.

scholarly journals Greenhouse gas balance of cropland conversion to bioenergy poplar short-rotation coppice

2016 ◽  
Vol 13 (1) ◽  
pp. 95-113 ◽  
Author(s):  
S. Sabbatini ◽  
N. Arriga ◽  
T. Bertolini ◽  
S. Castaldi ◽  
T. Chiti ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Arable Land ◽  
Hybrid Poplar ◽  
Ghg Emissions ◽  
Net Ecosystem Exchange ◽  
Short Rotation Coppice ◽  
Co2 Uptake ◽  
Greenhouse Gas Balance ◽  
Short Rotation ◽  
Ch4 And N2o

Abstract. The production of bioenergy in Europe is one of the strategies conceived to reduce greenhouse gas (GHG) emissions. The suitability of the land use change from a cropland (REF site) to a short-rotation coppice plantation of hybrid poplar (SRC site) was investigated by comparing the GHG budgets of these two systems over 24 months in Viterbo, Italy. This period corresponded to a single rotation of the SRC site. The REF site was a crop rotation between grassland and winter wheat, i.e. the same management of the SRC site before the conversion to short-rotation coppice. Eddy covariance measurements were carried out to quantify the net ecosystem exchange of CO2 (FCO2), whereas chambers were used to measure N2O and CH4 emissions from soil. The measurements began 2 years after the conversion of arable land to SRC so that an older poplar plantation was used to estimate the soil organic carbon (SOC) loss due to SRC establishment and to estimate SOC recovery over time. Emissions from tractors and from production and transport of agricultural inputs (FMAN) were modelled. A GHG emission offset, due to the substitution of natural gas with SRC biomass, was credited to the GHG budget of the SRC site. Emissions generated by the use of biomass (FEXP) were also considered. Suitability was finally assessed by comparing the GHG budgets of the two sites. CO2 uptake was 3512 ± 224 g CO2 m−2 at the SRC site in 2 years, and 1838 ± 107 g CO2 m−2 at the REF site. FEXP was equal to 1858 ± 240 g CO2 m−2 at the REF site, thus basically compensating for FCO2, while it was 1118 ± 521 g CO2 m−2 at the SRC site. The SRC site could offset 379.7 ± 175.1 g CO2eq m−2 from fossil fuel displacement. Soil CH4 and N2O fluxes were negligible. FMAN made up 2 and 4 % in the GHG budgets of SRC and REF sites respectively, while the SOC loss was 455 ± 524 g CO2 m−2 in 2 years. Overall, the REF site was close to neutrality from a GHG perspective (156 ± 264 g CO2eq m−2), while the SRC site was a net sink of 2202 ± 792 g CO2eq m−2. In conclusion the experiment led to a positive evaluation from a GHG viewpoint of the conversion of cropland to bioenergy SRC.

scholarly journals Performance of hybrid poplar clones in short rotation coppice in Mediterranean environments: analysis of genotypic stability

GCB Bioenergy ◽  
2013 ◽  
Vol 6 (6) ◽  
pp. 661-671 ◽  
Author(s):  
Hortensia Sixto ◽  
Paula Gil ◽  
Pilar Ciria ◽  
Francesc Camps ◽  
Mario Sánchez ◽  
...  
Keyword(s):  
Hybrid Poplar ◽  
Short Rotation Coppice ◽  
Short Rotation ◽  
Mediterranean Environments ◽  
Poplar Clones ◽  
Genotypic Stability

Morphological and physiological traits influencing biomass productivity in short-rotation coppice poplar

2004 ◽  
Vol 34 (7) ◽  
pp. 1488-1498 ◽  
Author(s):  
A M Rae ◽  
K M Robinson ◽  
N R Street ◽  
G Taylor
Keyword(s):  
Biomass Yield ◽  
Populus Deltoides ◽  
Hybrid Poplar ◽  
Biomass Productivity ◽  
Biomass Energy ◽  
Short Rotation Coppice ◽  
High Yield ◽  
Breeding Programs ◽  
Basal Diameter ◽  
Short Rotation

Fast-growing hybrid poplar (Populus spp.) have potential as a short-rotation coppice crop grown for biomass energy. This work identifies traits for fast growth studied in an American interspecific pedigree derived from Populus trichocarpa Torr. & A. Gray × Populus deltoides Marsh. grown in the United Kingdom for the first time. The biomass yield after the first coppice rotation was estimated to range from 0.04 to 23.68 oven-dried t·ha–1·year–1. This great range suggests that genotypes from this pedigree may be used to understand the genetic basis of high yield in short-rotation coppice, which would be advantageous for informing breeding programs for biomass crops. Relationships between stem, leaf, cell traits, and biomass yield were investigated. Partial least-squares analysis was used to order the traits by importance. The traits most influential on biomass were maximum stem height throughout the growing season, basal diameter, number of stems, and number of sylleptic branches, which showed high heritability, indicating excellent potential for breeding programs. The leaf traits, leaf area, number of leaves on the leading stem, and plastochron index were also associated with an increase in biomass, leading to a better understanding of this trait.

scholarly journals Greenhouse gas balance of cropland conversion to bioenergy poplar short rotation coppice

2015 ◽  
Vol 12 (10) ◽  
pp. 8035-8084 ◽  
Author(s):  
S. Sabbatini ◽  
N. Arriga ◽  
T. Bertolini ◽  
S. Castaldi ◽  
T. Chiti ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Fossil Fuel ◽  
Hybrid Poplar ◽  
Ghg Emissions ◽  
Net Ecosystem Exchange ◽  
Short Rotation Coppice ◽  
Greenhouse Gas Balance ◽  
Short Rotation ◽  
Fuel Substitution ◽  
Natural Gas Emissions

Abstract. The production of bioenergy in Europe is one of the strategies conceived to reduce greenhouse gas (GHG) emissions. The suitability of the land use change from a cropland (REF site) to a short rotation coppice plantation of hybrid poplar (SRC site) was investigated by comparing the GHG budgets of these two systems over 24 months in Viterbo, Italy. Eddy covariance measurements were carried out to quantify the net ecosystem exchange of CO2 (FCO2), whereas chambers were used to measure N2O and CH4 emissions from soil. Soil organic carbon (SOC) of an older poplar plantation was used to estimate via a regression the SOC loss due to SRC establishment. Emissions from tractors and from production and transport of agricultural inputs (FMAN) were modelled and GHG emission offset due to fossil fuel substitution was credited to the SRC site considering the C intensity of natural gas. Emissions due to the use of the biomass (FEXP) were also considered. The suitability was finally assessed comparing the GHG budgets of the two sites. FCO2 was the higher flux in the SRC site (−3512 ± 224 g CO2 eq m−2 in two years), while in the REF site it was −1838 ± 107 g CO2 m−2 in two years. FEXP was equal to 1858 ± 240 g CO2 m−2 in 24 months in the REF site, thus basically compensating FCO2, while it was 1118 ± 521 g CO2 eq m−2 in 24 months in the SRC site. This latter could offset −379.7 ± 175.1 g CO2 eq m−2 from fossil fuel displacement. Soil CH4 and N2O fluxes were negligible. FMAN weighed 2 and 4% in the GHG budgets of SRC and REF sites respectively, while the SOC loss weighed 455 ± 524 g CO2 m−2 in two years. Overall, the REF site was close to neutrality in a GHG perspective (156 ± 264 g CO2 eq m−2), while the SRC site was a net sink of −2202 ± 792 g CO2 eq m−2. In conclusion the experiment led to a positive evaluation of the conversion of cropland to bioenergy SRC from a GHG viewpoint.

scholarly journals Production and Regression Models for Biomass and Carbon Captured in Gmelina arborea Roxb. Trees in Short Rotation Coppice Plantations in Costa Rica

Forests ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 593
Author(s):  
Carolina Tenorio ◽  
Róger Moya ◽  
Edgar Ortiz-Malavassi ◽  
Dagoberto Arias
Keyword(s):  
Costa Rica ◽  
Biomass Production ◽  
Regression Models ◽  
Carbon Capture ◽  
Goodness Of Fit ◽  
Short Rotation Coppice ◽  
Total Biomass ◽  
High Fertility ◽  
Gmelina Arborea ◽  
Short Rotation

Mortality, diameter at 30 cm over ground level, height, biomass production, and carbon capture (CC) for different tree components (trunk, bark, branches, and leaves) in two locations in Costa Rica, during their first three years and with three plantation spacings (1.0 × 0.5 m, 1.0 × 1.0 m, and 1.0 × 2.0 m) were obtained for Gmelina arborea Roxb. trees growing in short rotation coppice systems (SRC). In addition, regression models were developed to predict biomass production and CC using location, age, spacing, and their interactions. Biomass production was measured by weight of trees without considering dendrometric variables. Results showed that mortality was lower than 15% for one location, with probable high fertility, and almost 85% for the other location. Diameter and height of trees increased with plantation age in both locations. The highest biomass production and CC were observed in the spacings of 1.0 × 0.5 m2 and 1.0 × 1.0 m2, with 20 Mg/ha/year and 8 Mg/ha/year, respectively. The models to predict biomass production in trunk with bark, branches, leaves, total biomass without leaves, and CC in trunk, branch, and total biomass were developed using this equation: Y = β1 + β2 (location × age) + β3 (age) + β4 (spacing). The R2 values varied from 0.66 to 0.84, with error from 0.88 to 10.75 and indicators of goodness of fit from 60 to 83%.

scholarly journals Nitrate leaching and soil nitrous oxide emissions diminish with time in a hybrid poplar short-rotation coppice in southern Germany

GCB Bioenergy ◽  
2016 ◽  
Vol 9 (3) ◽  
pp. 613-626 ◽  
Author(s):  
Eugenio Díaz-Pinés ◽  
Saúl Molina-Herrera ◽  
Michael Dannenmann ◽  
Judith Braun ◽  
Edwin Haas ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrate Leaching ◽  
Hybrid Poplar ◽  
Short Rotation Coppice ◽  
Nitrous Oxide Emissions ◽  
Southern Germany ◽  
Short Rotation

Social Position and Interest Recognition: The Voter in Broadview, or Are Voters Fools?

1973 ◽  
Vol 6 (1) ◽  
pp. 131-139
Author(s):  
J. Paul Grayson
Keyword(s):  
Social Position ◽  
The Other ◽  
The Past ◽  
Other Hand ◽  
Electoral Change ◽  
Personal Needs

In a brief footnote in Political Man, S.M. Lipset argued that political scientists had, in the past, approached the phenomenon of electoral change in terms of its being “a rational reaction to new situations or factors.” Sociologists and social psychologists who had channelled their endeavours in this directtion, on the other hand, had, Lipset argued, placed emphasis elsewhere: when it came to explanations of the vote, group pressures and the fulfilment of personal needs were first in their repertoire.

Phenotypic variation in growth and biomass distribution for two advanced-generation pedigrees of hybrid poplar

2005 ◽  
Vol 35 (8) ◽  
pp. 1779-1789 ◽  
Author(s):  
Stan D Wullschleger ◽  
T M Yin ◽  
S P DiFazio ◽  
T J Tschaplinski ◽  
L E Gunter ◽  
...  
Keyword(s):  
Genetic Control ◽  
Phenotypic Variation ◽  
Populus Deltoides ◽  
Populus Trichocarpa ◽  
Hybrid Poplar ◽  
Biological Research ◽  
Total Biomass ◽  
Biomass Distribution ◽  
Coarse Roots ◽  
Fractional Distribution

To assess the genetic control of biomass distribution in trees, phenotypic variation in the distribution of dry mass to stems, branches, leaves, coarse roots, and fine roots was examined in two hybrid poplar (Populus trichocarpa Torr. & A. Gray (T) × Populus deltoides Bartr. ex Marsh. (D)) families grown under field conditions. Family 331 was an inbred F2 (TD × TD) pedigree, whereas family 13 was an outbred backcross BC1 (TD × D) pedigree. Fractional distribution of total whole-tree biomass to shoots and roots during their establishment year averaged (±SD) 0.62 ± 0.09 and 0.38 ± 0.09, respectively, across 247 genotypes in family 331, and 0.57 ± 0.06 and 0.43 ± 0.06, respectively, across 160 genotypes in family 13. In contrast, fractional distribution of total biomass in 2-year-old trees was 0.79 ± 0.04 to shoots and 0.21 ± 0.04 to roots. Allometric analysis indicated that as trees increased in age, biomass was preferentially distributed to stems and branches, whereas distribution to roots declined. Quantitative trait loci (QTL) analysis for family 13 indicated 31 QTL (likelihood of odds >2.5) for traits measured. The percent phenotypic variation explained by any single QTL ranged from 7.5% to 18.3% and averaged 11.2% across all QTL. These results show that aboveground and belowground patterns of biomass distribution are under genetic control. This finding has wide-ranging implications for carbon sequestration, phytoremediation, and basic biological research in trees.

scholarly journals Geschäftsmänner zwischen Makedonien und Moesia Superior

2017 ◽  
pp. 205-225
Author(s):  
Elias Sverkos
Keyword(s):  
Its Region ◽  
Social Position ◽  
The Other ◽  
Northwestern Part ◽  
Other Hand ◽  
The Military

In this paper on the basis of the funerary inscription of a conductor named Gamicus, which was found in Hagio Pnevma (territorium of the Roman colony of Philippi), are examined the relations between Macedonia, Moesia Inferior and probably Epirus. Gamicus seems to belong to the senatorial family of Pontii; they are attested in the inscriptions from Ulpianum and its region and were even related by marriage with another senatorial family, i.e. the Furii. Both families owed their social position to the mines. Apart from the well known senator Gaius Furius Octavianus and his mother Furia Caecilia, the activity of the domus Furiana is known by the presence of its vilici and servi. Epigraphical testimonies show that the large estates of the Furii as well as the Pontii were situated in the southern part of Ulpianum and in the northwestern part of Scupi. Although the gentilicium Furius is also widespread in the province of Macedonia, of particular interest to our subject, however, seem to be two inscriptions from the territorium of the Roman colony of Philippi. The first one is the epitaph erected by M. Varinius M. l. Celer for himself, his wife Varinia Marita, his daughters Primigenia and Pyralis as well as his son-in-law Furius Alcimus. Τhe second inscription (probably a dedication) lists the military offices of D. Furius Octavius Secundus, originally from Cures Sabinis, as well as the privileges bestowed to him by two colonies, Actia Nicopolis et Ulpia... The identification of Furius Alcimus with an homonymous libertus maternus of Furius Octavianus, referred in a passage of Ulpian, should be excluded. On the other hand, the presence of D. Furius Octavius Secundus in Philippi may nevertheless be connected to the exploitation of mines and quarries of this region. Furthermore, it is possible that he is an ancestor of C. Furius Octavianus and has prepared the requirements for the wealth of the domus Furiana and its adlectio in senatum.

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